Organic light emitting diode comprising organometallic compound and various types of host materials

Abstract

The present disclosure relates to an emission layer including a dopant material containing an organometallic compound represented by Chemical Formula 1 and host materials containing a compound represented by Chemical Formula 2 and a compound represented by Chemical Formula 3, and an organic light emitting diode including the same. It may be possible to achieve the characteristics of the organic light emitting diode, such as desirable luminous efficiency and long lifetime.

Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] The present application claims priority to and the benefit of Korean Patent Application No. 10-2023-0144054 filed on Oct. 25, 2023 in the Korean Intellectual Property Office, the disclosure of which is hereby incorporated by reference in its entirety.BACKGROUNDTechnical Field

[0002] The present disclosure relates to an organic light emitting diode including an organometallic compound and various types of host materials.Description of the Related Art

[0003] Interest in display devices is increasing according to the application to various fields. As one of the display devices, a technology of an organic light emitting display devices including an organic light emitting diode (OLED) is developing rapidly.

[0004] The OLED is an element for emitting energies of excitons as light after forming electrons and holes in pair to form excitons when charges are injected into an emission layer formed between an anode and a cathode. Compared to conventional display technologies, the OLED can implement a low voltage, consume relatively less power, have excellent colors, can be applied to a flexible substrate to be used variously, and can allow a display device to be freely adjusted in size.

[0005] The OLED can have a wide viewing angle and a high contrast ratio compared to liquid crystal display (LCD) devices and may not require a backlight, making it lightweight and ultra-thin. The OLED is formed by arranging a plurality of intermediate layers, such as a hole injection layer, a hole transport layer, a hole transport auxiliary layer, an electron blocking layer, an electron transport layer, an electron injection layer, and the like between the cathode (electron injection electrode) and the anode (hole injection electrode).

[0006] In the structure of the OLED, when a voltage is applied between two electrodes, electrons and holes are injected from the cathode and the anode, respectively, and excitons generated from the emission layer fall to a ground state to emit light.

[0007] Organic materials used in the OLED may be largely classified into a light emitting material and a charge transport material. The light emitting material is an important factor in determining the luminous efficiency of the OLED, and the light emitting material should have high quantum efficiency, excellent mobility of electrons and holes, and be uniformly and stably present in the emission layer. The light emitting material is classified into light emitting materials, such as blue, red, and green, depending on colored light and is used as hosts and dopants to increase color purity and increase luminous efficiency through energy transfer as color materials.

[0008] In the case of fluorescent materials, while only a singlet of about 25% of the excitons formed in the emission layer is used to generate light, and a triplet of 75% is mostly lost as heat, phosphorescent materials has a luminous mechanism that converts both the singlet and the triplet into light.

[0009] So far, organic metal compounds have been used as phosphorescent materials used in the OLED. There is still a technical need to improve the performance of the OLED by deriving high-efficiency phosphorescent dopant materials and applying hosts with optimal photophysical characteristics to improve the efficiency and lifetime of the element compared to conventional OLEDs.SUMMARY

[0010] Therefore, the present disclosure is directed to providing an organic light emitting diode in which an organometallic compound and various types of host materials, which are capable of improving a driving voltage, efficiency, and a lifetime, are applied to an organic emission layer.

[0011] Objects of the present disclosure are not limited to the above-mentioned object. Other objects and advantages of the present disclosure that are not mentioned may be understood based on following descriptions, and may be more clearly understood based on aspects of the present disclosure. Further, it may be easily understood that the objects and advantages of the present disclosure may be realized using means shown in the claims and combinations thereof.

[0012] To achieve these and other advantages and in accordance with objects of the disclosure, as embodied and broadly described herein, an organic light emitting diode includes a first electrode, a second electrode facing the first electrode, and an intermediate layer disposed between the first electrode and the second electrode, wherein the intermediate layer includes an emission layer, and the emission layer includes a dopant material and a host material, the dopant material includes an organometallic compound represented by Chemical Formula 1 below, and the host material includes a mixture of a compound represented by Chemical Formula 2 below and a compound represented by Chemical Formula 3 below:in Chemical Formula 1,

[0014] X is one selected from oxygen (O), sulfur (S), and selenium (Se),

[0015] R1 to R6 are, each independently, one selected from deuterium, halogen, halide, an alkyl group, a cycloalkyl group, a heteroalkyl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group, a silyl group, an alkenyl group, a cycloalkenyl group, a heteroalkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an acyl group, a carboxylic acid group, a nitrile group, an isonitrile group, a sulfanyl group, a phosphino group, a group formed by connecting two or more of the groups mentioned above, and combinations thereof,

[0016] R7 and R8 are, each independently, one selected from hydrogen, deuterium, a C1-C6 linear alkyl group, a C3-C6 branched alkyl group, and a C3-C6 cycloalkyl group,

[0017] optionally, at least one of R1 to R8 are partially or entirely deuterated,

[0018] a and b are, each independently, an integer from 0 to 4, and when a and b are each independently an integer from 2 to 4, a plurality of R1 or a plurality of R2 are the same or different from each other,

[0019] c and f are, each independently, an integer from 0 to 3, and when c and f are each independently an integer of 2 or 3, a plurality of R3 or a plurality of R6 are the same or different from each other,

[0020] d is an integer from 0 to 2, and when d is an integer of 2, a plurality of R4 are the same or different from each other,

[0021] e is an integer from 0 to 5, and when e is an integer from 2 to 5, a plurality of R5 are the same or different from each other, and

[0022] m is an integer from 1 to 8, and n is an integer from 0 to 2,in Chemical Formula 2,

[0024] R9 are, each independently, one selected from hydrogen, deuterium, an alkyl group, an alkoxy group, a thioalkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aryl group, an arylamino group, a heteroaryl group, and a group formed by connecting two or more of the groups mentioned above, or two of R9 bond to each other to form a spirofluorene,

[0025] R10 and R11 are, each independently, one selected from hydrogen, deuterium, an alkyl group, an alkoxy group, a thioalkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an amino group, an arylamino group, an aryl group, a heteroaryl group, and a group formed by connecting two or more of the groups mentioned above,

[0026] L1 is one selected from a single bond, a phenylene group, a biphenylene group, a divalent naphthalene group, a divalent dibenzofuran group, and a divalent dibenzothiophene group, Ar1 and Ar2 are, each independently, one selected from an aryl group, an arylamino group, a heteroaryl group, and a group formed by connecting two or more of the groups mentioned above, and when Ar1 and Ar2 are the group formed by connecting two or more of the groups mentioned above, the two or more of the groups are connected via a single bond, an alkylene group, —O—, or a carbonyl group, and

[0027] optionally, at least one hydrogen of each of Ar1 and / or Ar2 is substituted with a substituent R12, and R12 is, each independently, at least one selected from the group consisting of deuterium, halogen, an alkyl group, an alkoxy group, a thioalkyl group, an alkylsilyl group and a group formed by connecting two or more of the groups mentioned above,in Chemical Formula 3,

[0029] Ar3, Ar4, Ar5, and Ar6 are, each independently, one selected from hydrogen, deuterium, halogen, a C1-C30 alkyl group, a C6-C50 aryl group, a C3-C50 heteroaryl group, and a C3-C30 cycloalkyl group,

[0030] L2 is one selected from a single bond, a C6-C50 arylene group, and a C5-C50 heteroarylene group,

[0031] Y is nitrogen (N) or CH,

[0032] when g is 2 or more, any two of a plurality of Ar5 that are adjacent are optionally bonded to form a fused ring structure of a monocyclic or polycyclic, C6-C30 aromatic group or C3-C30 heteroaromatic group, and one or more of hydrogens of the fused ring structure can be substituted with a substituent selected from deuterium, a C1-C10 alkyl group, a C6-C20 aryl group, and a C3-C20 heteroaryl group, and

[0033] when h is 2 or more, any two of a plurality of Ar6 that are adjacent are optionally bonded to form a fused ring structure of a monocyclic or polycyclic, C6-C30 aromatic group or C3-C30 heteroaromatic group, one or more of hydrogens of the fused ring structure can be substituted with a substituent R13, and R13 is at least one selected from deuterium, a C1-C10 alkyl group, a C6-C20 aryl group, and a C3-C20 heteroaryl group.

[0034] According to another aspect of the present disclosure, an organic light emitting diode includes a first electrode, a second electrode facing the first electrode, and one or more light emitting parts positioned between the first electrode and the second electrode, wherein at least one of the light emitting parts includes a green phosphorescent light emission layer, the green phosphorescent light emission layer includes a dopant material and a host material, the dopant material includes an organometallic compound represented by Chemical Formula 1 below, and the host material includes a compound represented by Chemical Formula 2 below and a compound represented by Chemical Formula 3 below, and the definition of Chemical Formulas 1 to 3 are the same as those defined in one aspect of the present disclosure.

[0035] Effects of the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those skilled in the art from following descriptions.

[0036] It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are merely by way of example and are intended to provide further explanation of the inventive concepts as claimed.BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the principles of the disclosure. In the drawings:

[0038] FIG. 1 is a cross-sectional view schematically showing an organic light emitting diode according to one embodiment of the present disclosure.

[0039] FIG. 2 is a cross-sectional view schematically showing the organic light emitting diode with a tandem structure having two light emitting parts according to one embodiment of the present disclosure.

[0040] FIG. 3 is a cross-sectional view schematically showing the organic light emitting diode with a tandem structure having three light emitting parts according to one embodiment of the present disclosure.

[0041] FIG. 4 is a cross-sectional view schematically showing an organic light emitting diode display device to which the organic light emitting diode according to an exemplary embodiment of the present disclosure is applied.DETAILED DESCRIPTION

[0042] Reference will now be made in detail to some of the examples and embodiments of the disclosure illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0043] The above-described objects, features, and advantages will be described below in detail with reference to the accompanying drawings, and thus those skilled in the art to which the present disclosure pertains will be able to easily carry out the technical spirit of the present disclosure. In describing the present disclosure, when it is determined that a detailed description of the known technology related to the present disclosure may unnecessarily obscure the gist of the present disclosure, a detailed description thereof will be omitted. Hereinafter, exemplary embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar components.

[0044] In the specification, when terms “including,”“having,”“consisting of,”“arranging,”“providing,” and the like are used, other portions can be added unless “˜only” is used. When a component is expressed in the singular, it includes a case in which the component is provided as a plurality of components unless specifically stated otherwise.

[0045] In construing a component in the specification, the component is construed as including the margin of error even when there is no separate explicit description.

[0046] In the specification, the arrangement of an arbitrary component on an “upper portion (or a lower portion)” of a component or “above (or under)” the component may not only mean that the arbitrary component is disposed in contact with an upper surface (or a lower surface) of the component, but also mean that other components may be interposed between the component and the arbitrary component disposed above (or under) the component.

[0047] The term “halo” or “halogen” used herein includes fluorine, chlorine, bromine, and iodine.

[0048] The term “alkyl group” used herein indicates both linear alkyl radicals and branched alkyl radicals. Unless otherwise stated, the linear alkyl group contains 1 to 60 carbon atoms, 1 to 30 carbon atoms, 1 to 20 carbon atoms, or 1 to 10 carbon atoms, the branched alkyl group contains 3 to 60 carbon atoms, 3 to 30 carbon atoms, 3 to 20 carbon atoms, or 3 to 10 carbon atoms, and may include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, and the like, and additionally, the alkyl group may be substituted arbitrarily.

[0049] The term “cycloalkyl group” used herein indicates cyclic alkyl radicals. Unless otherwise stated, the cycloalkyl group contains 3 to 60 carbon atoms, 3 to 30 carbon atoms, 3 to 20 carbon atoms, or 3 to 10 carbon atoms, and may include cyclopropyl, cyclopentyl, cyclohexyl, and the like, and additionally, the cycloalkyl group may be substituted arbitrarily.

[0050] The term “alkenyl group” used herein indicates both linear alken radicals and branched alken radicals. Unless otherwise stated, the alkenyl group contains 2 to 60 carbon atoms, 2 to 30 carbon atoms, 2 to 20 carbon atoms, or 2 to 10 carbon atoms, and additionally, the alkenyl group may be substituted arbitrarily.

[0051] The term “cycloalkenyl group” used herein indicates cyclic alkenyl radicals. Unless otherwise stated, the cycloalkenyl group contains 3 to 60 carbon atoms, 3 to 30 carbon atoms, 3 to 20 carbon atoms, or 3 to 10 carbon atoms, and additionally, the cycloalkenyl group may be substituted arbitrarily.

[0052] The term “alkynyl group” used herein indicates both linear alkyne radicals and branched alkyne radicals. Unless otherwise stated, the alkynyl group contains 2 to 60 carbon atoms, 2 to 30 carbon atoms, 2 to 20 carbon atoms, or 2 to 10 carbon atoms. Additionally, the alkynyl group may be substituted arbitrarily.

[0053] The term “cycloalkynyl group” used herein indicates cyclic alkynyl radicals. Unless otherwise stated, the cycloalkynyl group contains 3 to 60 carbon atoms, 3 to 30 carbon atoms, 3 to 20 carbon atoms, 8 to 20 carbons, or 3 to 10 carbon atoms, and additionally, the cycloalkynyl group may be substituted arbitrarily.

[0054] The terms “aralkyl group” and “arylalkyl group” used herein are used interchangeably and indicate an alkyl group having an aromatic group as a substituent, and unless otherwise stated, the aralkyl group contains 7 to 60 carbon atoms, 7 to 30 carbon atoms, or 7 to 20 carbon atoms, and additionally, the aralkyl group (arylalkyl group) may be substituted arbitrarily.

[0055] The terms “aryl group” and “aromatic group” used herein may include conjugated structures and may include a single ring group and a polycyclic ring group. The polycyclic ring may include a “condensed ring,” which are two or more rings where two carbons are shared by two adjacent rings. Unless otherwise stated, the aryl group contains 6 to 60 carbon atoms, 6 to 30 carbon atoms, or 6 to 20 carbon atoms. The monocyclic aryl group includes a phenyl group, a biphenyl group, a terphenyl group and the like, but is not limited thereto. The polycyclic aryl group includes a naphthyl group, an anthracenyl group, a phenanthryl group, a triphenylenyl group, a fluorenyl group or the like, but is not limited thereto. Additionally, the aryl group may be substituted arbitrarily. The aforementioned description of the aryl group may be applied to an arylene group, except that the arylene group is a divalent group.

[0056] The term “heterocyclic ring group” used herein indicates that one or more of the carbon atoms constituting an aryl group, a cycloalkyl group, a cycloalkenyl group, a cycloalkynyl group, an aralkyl group (arylalkyl group), an arylamino group, and the like are substituted with a heteroatom, such as oxygen (O), nitrogen (N), sulfur (S), etc., and with reference to the above definition, includes a heteroaryl group, a heterocycloalkyl group, a heterocycloalkenyl group, a heterocycloalkynyl group, a heteroaralkyl group (heteroarylalkyl group), a heteroarylamino group, and the like, and unless otherwise stated, the heteroaryl group contains 2 to 60 carbon atoms, 2 to 30 carbon atoms, or 2 to 20 carbon atoms. Examples of the heteroaryl group include a thiophene group, a furan group, a pyridyl group, a pyrimidyl group, a triazine group, a quinolinyl group, a quinazoline group, a quinoxalinyl group, a benzothienopyrimidyl group, a benzofuropyrimidinyl group, a carbazole group, N-phenyl carbazole group, a benzothiophene group, a dibenzothiophene group, a benzofuranyl group, a dibenzofuranyl group, and the like, but are not limited thereto. Additionally, the heterocyclic ring group may be substituted arbitrarily. The aforementioned description of the heteroaryl group can be applied to a heteroarylene group, except that the heteroarylene group is a divalent group.

[0057] Unless otherwise stated, the term “carbocyclic ring” used herein may be used as the term including all of “cycloalkyl group,”“cycloalkenyl group,” and “cycloalkynyl group,” which are alicyclic ring groups, and “aryl group (aromatic group),” which is an aromatic ring group.

[0058] The terms “heteroalkyl group,”“heteroalkenyl group,”“heteroalkynyl group,” and “heteroaralkyl group (heteroarylalkyl group)” used herein indicate that one or more of the carbon atoms constituting the corresponding “alkyl group,”“alkenyl group,”“alkynyl group,” and “aralkyl group (arylalkyl group)” are substituted with heteroatoms, such as oxygen (O), nitrogen (N), and sulfur (S), and additionally, the heteroalkyl group, the heteroalkenyl group, the heteroalkynyl group, and heteroaralkyl group (heteroarylalkyl group) may be substituted arbitrarily.

[0059] The terms “alkylamino group,”“aralkyl amino group,”“arylamino group,” and “heteroarylamino group” used herein indicate that the amine group is substituted with the alkyl group, the aralkyl group, the aryl group, and the heteroaryl group that is a hetero ring and include all of primary, secondary, and tertiary amines, and additionally, the alkylamino group, the aralkylamino group, the arylamino group, and the heteroarylamino group may be substituted arbitrarily.

[0060] The terms “alkylsilyl group,”“arylsilyl group,”“alkoxy group,”“aryloxy group,”“alkylthio group,” and “arylthio group” indicate that each of the silyl group, the oxy group, or the thio group is substituted with the alkyl group and the aryl group, and additionally, the alkylsilyl group, the arylsilyl group, the alkoxy group, the aryloxy group, the alkylthio group, and the arylthio group may be substituted arbitrarily.

[0061] The term “substituted” used herein indicates that, instead of a hydrogen atom (H) being bonded to a carbon atom, another substituent is bonded to the corresponding carbon atom. A substituent for the case of being “substituted,” may be with a single substituent or a plurality of substituents. When a plurality of substituents are present, and each substituent may be the same as or different from each other.

[0062] Unless otherwise stated herein, the substituent(s) may be selected from the group consisting of deuterium; halogen; alkyl; cycloalkyl; heteroalkyl; arylalkyl; alkoxy; aryloxy; amino; silyl; alkenyl; cycloalkenyl; heteroalkenyl; alkynyl; aryl; heteroaryl; acyl; carboxylic acid group; ester group; nitrile group; isonitrile group; sulfanyl; sulfinyl; sulfonyl; phosphino; and a group formed by connecting two or more of the groups mentioned above, and some or all of the substituents may be deuterated.

[0063] As used herein, “deuterated” may indicate substitution with deuterium instead of light hydrogen in a compound.

[0064] Unless otherwise stated herein, a position to be substituted is not limited as long as it is a position where a hydrogen atom is substituted, that is, a position where a substituent may be substituted, and when two or more substituents are present, each substituent may be the same as or different from each other.

[0065] The objects and substituents as defined herein may be the same as or different from each other unless otherwise stated.

[0066] Hereinafter, a structure of an organometallic compound and an organic light emitting diode including the same according to the present disclosure will be described in detail.

[0067] Conventionally, organometallic compounds have been used as dopants in phosphorescent light emission layers, and for example, structures such as 2-phenylpyridine are known as main ligand structures of the organometallic compounds. However, since the conventional light emitting dopants have limitations in increasing the efficiency and lifetime of organic light emitting diodes, it may be desirable to develop new light emitting dopant materials. The present disclosure was completed by experimentally confirming that by mixing a hole transport type host and an electron transport type host as host materials together with the dopant material, it was possible to further increase the efficiency and lifetime of the organic light emitting diode and decrease the driving voltage, thereby improving the characteristics of the organic light emitting diode.

[0068] Specifically, referring to FIG. 1 according to one embodiment of the present disclosure, there may be provided an organic light emitting diode 100 including a first electrode 110, a second electrode 120 facing the first electrode 110, and an intermediate layer 130 disposed between the first electrode 110 and the second electrode 120. The intermediate layer 130 may include an emission layer 160, the emission layer 160 may include a dopant material 160′ and host materials 160″ and 160′″ and include the organometallic compound represented by Chemical Formula 1 below as the dopant material 160′, and the host material may include two types of the compound represented by Chemical Formula 2 below as the hole transport type host 160″ and the compound represented by Chemical Formula 3 below as the electron transport type host 160′″.in Chemical Formula 1,

[0070] X may be one selected from oxygen (O), sulfur (S), and selenium (Se),

[0071] R1 to R6 may, each independently, be one selected from deuterium, halogen, halide, an alkyl group, a cycloalkyl group, a heteroalkyl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group, a silyl group, an alkenyl group, a cycloalkenyl group, a heteroalkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an acyl group, a carboxylic acid group, a nitrile group, an isonitrile group, a sulfanyl group, a phosphino group, a group formed by connecting two or more of the groups mentioned above, and combinations thereof,

[0072] R7 and R8 may, each independently, be one selected from hydrogen, deuterium, a C1-C6 linear alkyl group, a C3-C6 branched alkyl group, and a C3-C6 cycloalkyl group,

[0073] optionally, at least one of R1 to R8 are partially or entirely deuterated,

[0074] a and b are, each independently, an integer from 0 to 4, and when a and b are each independently an integer from 2 to 4, a plurality of R1 or a plurality of R2 are the same or different from each other,

[0075] c and f are, each independently, an integer from 0 to 3, and when c and f are each independently an integer of 2 or 3, a plurality of R3 or a plurality of R6 are the same or different from each other,

[0076] d is an integer from 0 to 2, and when d is an integer of 2, a plurality of R4 are the same or different from each other,

[0077] e is an integer from 0 to 5, and when e is an integer from 2 to 5, a plurality of R5 are the same or different from each other, and

[0078] m is an integer from 1 to 8, and n is an integer from 0 to 2,in Chemical Formula 2,

[0080] R9 may, each independently, be one selected from hydrogen, deuterium, an alkyl group, an alkoxy group, a thioalkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aryl group, an arylamino group, a heteroaryl group, and a group formed by connecting two or more of the groups mentioned above, or two of R9 bond to each other to form a spirofluorene,

[0081] R10 and R11 may, each independently, be one selected from hydrogen, deuterium, an alkyl group, an alkoxy group, a thioalkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an amino group, an arylamino group, an aryl group, a heteroaryl group, and a group formed by connecting two or more of the groups mentioned above,

[0082] L1 may be one selected from a single bond, a phenylene group, a biphenylene group, a divalent naphthalene group, a divalent dibenzofuran group, and a divalent dibenzothiophene group,

[0083] Ar1 and Ar2 may, each independently, be one selected from an aryl group, an arylamino group, a heteroaryl group, and a group formed by connecting two or more of the groups mentioned above, and when Ar1 and Ar2 are the group formed by connecting two or more of the groups mentioned above, the two or more of the groups are connected via a single bond, an alkylene group, —O—, or a carbonyl group, and

[0084] optionally, at least one hydrogen of each of Ar1 and / or Ar2 may be substituted with a substituent R12, and R12 is, each independently, at least one selected from the group consisting of deuterium, halogen, an alkyl group, an alkoxy group, a thioalkyl group, an alkylsilyl group and a group formed by connecting two or more of the groups mentioned above.in Chemical Formula 3,

[0086] Ar3, Ar4, Ar5, and Ar6 are, each independently, one selected from hydrogen, deuterium, halogen, a C1-C30 alkyl group, a C6-C50 aryl group, a C3-C50 heteroaryl group, and a C3-C30 cycloalkyl group,

[0087] L2 is one selected from a single bond, a C6-C50 arylene group, and a C5-C50 heteroarylene group,

[0088] Y is nitrogen (N) or CH2,

[0089] g and h are, each independently, integers from 1 to 4,

[0090] when g is 2 or more, any two of a plurality of Ar5 that are adjacent can be optionally bonded to form a fused ring structure of a monocyclic or polycyclic, C6-C30 aromatic group or C3-C30 heteroaromatic group, and one or more of hydrogens of the fused ring structure can be optionally substituted with a substituent selected from deuterium, a C1-C10 alkyl group, a C6-C20 aryl group, and a C3-C20 heteroaryl group, and

[0091] when h is 2 or more, any two of a plurality of Ar6 that are adjacent can be optionally bonded to form a fused ring structure of a monocyclic or polycyclic, C6-C30 aromatic group or C3-C30 heteroaromatic group, one or more of hydrogens of the fused ring structure can be optionally substituted with a substituent R13, and R13 is at least one selected from deuterium, a C1-C10 alkyl group, a C6-C20 aryl group, and a C3-C20 heteroaryl group.

[0092] According to one embodiment of the present disclosure, m in Chemical Formula 1 may be 1 or more, for example, an integer of 1 to 3, and for example, an integer of 1 or 2.

[0093] According to some embodiments of the present disclosure, (R1)a and (R2)b in Chemical Formula 1 may, each independently, be at least one selected from the group consisting of hydrogen, deuterium, a C1-C10 alkyl group, a C6-C30 aryl group, a C3-C30 heteroaryl group, and a C7-C40 arylalkyl group, and a and b, each independently, may be an integer of 1 or 2.

[0094] According to some embodiments of the present disclosure, at least one of R1 or at least one of R2 in Chemical Formula 1 may be a C1-C3 alkyl group, and in this case, the C1-C3 alkyl group as R1 or R2 may be substituted with deuterium.

[0095] According to some embodiments of the present disclosure, at least one R3 in Chemical Formula 1 may be a C1-C3 linear alkyl group, and in this case, R3 may be substituted with deuterium.

[0096] According to some embodiments of the present disclosure, (R4)d in Chemical Formula 1 may indicate all hydrogen.

[0097] According to some embodiments of the present disclosure, (R5)e in Chemical Formula 1 may indicate all hydrogen, or otherwise, 1 or 2 of R5 may not be hydrogen (i.e., e is 1 or 2).

[0098] According to some embodiments of the present disclosure, (R6)f in Chemical Formula 1 may indicate all hydrogen.

[0099] According to one embodiment of the present disclosure, R7 and R8 define an aralkyl group bonded to the pyridine moiety in Chemical Formula 1 and preferably, may, each independently, be hydrogen, deuterium, a C1-C3 linear alkyl group, and a C3-C6 branched alkyl group, and optionally, the C1-C3 linear alkyl group or the C3-C6 branched alkyl group selected as R7 and R8 may, each independently, be substituted with deuterium.

[0100] According to one embodiment of the present disclosure, the organometallic compound represented by Chemical Formula 1 may be one of Compounds GD1 to GD20 below, but is not limited thereto as long as it is included in the definition of Chemical Formula 1.

[0101] According to one embodiment of the present disclosure, R10 and R11 in Chemical Formula 2 may, each independently, be hydrogen or deuterium.

[0102] According to one embodiment of the present disclosure, L1 in Chemical Formula 2 may be a single bond or a ring group, and the ring group may be one selected from a phenylene group, a biphenylene group, a divalent naphthalene group, a divalent dibenzofuran group, and a divalent dibenzothiophene group, but is not necessarily limited thereto. When L1 is not a single bond, the connection positions in L1 while connecting fluorene moiety with the nitrogen (N) of the amino group are not particularly limited.

[0103] According to one embodiment of the present disclosure, L1 in Chemical Formula 2 may be one selected from a single bond and a phenylene group.

[0104] An exemplary structure of L1 in Chemical Formula 2 is as follows, but is not limited thereto.

[0105] According to one embodiment of the present disclosure, Ar1 and Ar2 in Chemical Formula 2 may, each independently, be one selected from the group consisting of an aryl group; an arylamino group; a heteroaryl group; and a group formed by connecting two or more of the groups mentioned above. In the group formed by connecting two or more of the groups mentioned above, the two or more of an aryl group and a heteroaryl group may be connected via a single bond, an alkylene group, —O—, or a carbonyl group. Optionally, at least one hydrogen of each of Ar1 and / or Ar2 may be substituted with a substituent R12, and R12 may, each independently, be one selected from the group consisting of deuterium, halogen, an alkyl group, an alkoxy group, a thioalkyl group, an alkylsilyl group and a group formed by connecting two or more of the groups mentioned above.

[0106] Exemplary structures of Ar1 and Ar2 in Chemical Formula 2 are as follows, but are not limited thereto.

[0107] According to one embodiment of the present disclosure, the compound represented by Chemical Formula 2 may be one of Compounds GHH1 to GHH30 below, but is not limited thereto as long as it is included in the definition of Chemical Formula 2.

[0108] According to one embodiment of the present disclosure, Ar3 and Ar4 in Chemical Formula 3 may, each independently, be one selected from a C6-C50 aryl group and a C3-C50 heteroaryl group.

[0109] According to one embodiment of the present disclosure, Ar3, Ar4, Ar5, and Ar6 in Chemical Formula 3 may, each independently, be one selected from a phenyl group, a biphenyl group, a naphthyl group, a dibenzofuran group, a carbazole group, an indole group, a dibenzothiophene group, a chrysene group, a benzochrysene group, a phenanthrene group, a benzophenanthrene group, a benzonaphthothiophene group, and a benzonaphthofuran group, for example, one of a phenyl group, a biphenyl group, a dibenzofuran group, a dibenzothiophene group, and a carbazole group, but are not limited thereto.

[0110] According to one embodiment of the present disclosure, when Ar5 or Ar6 in Chemical Formula 3 is formed in plural, a ring structure formed by fusing two adjacent Ar5 or two adjacent Ar6 may be an aryl group or a heteroaryl group.

[0111] According to one embodiment of the present disclosure, the ring structure formed by the fusion may be a structure fused to the carbazole group in Chemical Formula 3 and may be a structure in which 5-membered and 6-membered ring structures are bonded consecutively. For example, the structure fused to the carbazole group may bewherein each * indicates a connection position to a benzene ring of the carbazole moiety, Z is one selected from NR20, C(R20)2, oxygen (O), and sulfur (S), and R20 may be each independently selected from a C1-C10 alkyl group, a C6-C20 aryl group and a C3-C20 heteroaryl group.According to one embodiment of the present disclosure, Y in Chemical Formula 3 may be nitrogen (N).

[0113] According to one embodiment of the present disclosure, L2 in Chemical Formula 3 may be a single bond or a ring group, and the ring group may be a C6-C50 arylene group or a C5-C50 heteroarylene group.

[0114] According to one embodiment of the present disclosure, when L2 in Chemical Formula 3 is a ring group, and the ring group may be, for example, one selected from the group consisting of a phenylene group, a biphenylene group, a divalent naphthalene group, a divalent dibenzofuran group and a divalent dibenzothiophene group, and, for example, one selected from a single bond or a phenylene group, but is not necessarily limited thereto.

[0115] When L2 in Chemical Formula 3 is not the single bond, the positional relationship within the structure of L2 that connects to a triazine portion (e.g., a case in which Y in Chemical Formula 3 is N) and the nitrogen (N) of carbazole is not particularly limited.

[0116] According to one embodiment of the present disclosure, the compound represented by Chemical Formula 3 may be one of Compounds GEH1 to GEH30 below, but is not limited thereto as long as it is included in the definition of Chemical Formula 3.

[0117] In addition, in the organic light emitting diode 100, the intermediate layer 130 disposed between the first electrode 110 and the second electrode 120 may have a structure including a hole injection layer (HIL) 140, a hole transport layer (HTL) 150, the emission layer (EML) 160, an electron transport layer (ETL) 170, and an electron injection layer (EIL) 180 sequentially from the first electrode 110. The second electrode 120 may be formed on the electron injection layer 180, and a protective film (not shown) may be formed on the second electrode 120.

[0118] In addition, although not shown in FIG. 1, one or more of a hole transport auxiliary layer and an electron blocking layer may be further added between the hole transport layer 150 and the emission layer 160.

[0119] The hole transport auxiliary layer may contain a compound with good hole transport characteristics and adjust the hole injection characteristics by reducing an HOMO energy level difference between the hole transport layer 150 and the emission layer 160, thereby reducing the accumulation of holes at an interface between the hole transport auxiliary layer and the emission layer 160. Therefore, it is possible to reduce a quenching phenomenon that excitons are annihilated by polarons at the interface. Therefore, it is possible to reduce a degradation phenomenon of the element, thereby stabilizing the element and increasing efficiency and lifetime thereof.

[0120] The electron blocking layer can prevent the introduction of electrons into the hole transport layer by adjusting the movement of electrons and the recombination with holes, thereby increasing the efficiency and lifetime of the organic light emitting diode. A material forming the electron blocking layer may be selected from TCTA, tris[4-(diethylamino)phenyl]amine, N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine, TAPC, MTDATA, mCP, mCBP, CuPC, DNTPD, TDAPB, DCDPA, 2,8-bis(9-phenyl-9H-carbazol-3-yl)dibenzo[b,d]thiophene, and the like. In addition, the electron blocking layer may include an inorganic compound. The inorganic compound may be selected from halide compounds, such as LiF, NaF, KF, RbF, CsF, FrF, MgF2, CaF2, SrF2, BaF2, LiCl, NaCl, KCl, RbCl, CsCl, and FrCl, and oxides, such as Li2O, Li2O2, Na2O, K2O, Rb2O, Rb2O2, Cs2O, Cs2O2, LiAlO2, LiBO2, LiTaO3, LiNbO3, LiWO4, Li2CO, NaWO4, KAlO2, K2SiO3, B2O5, Al2O3, and SiO2, but is not necessarily limited thereto.

[0121] The first electrode 110 may be an anode and may be made of ITO, IZO, tin-oxide, or zinc-oxide, which is a conductive material with a relatively high work function value, but is not limited thereto.

[0122] The second electrode 120 may be a cathode and may include Al, Mg, Ca, Ag, or an alloy or combination thereof, which is a conductive material with a relatively low work function value, but is not limited thereto.

[0123] The hole injection layer 140 may be positioned between the first electrode 110 and the hole transport layer 150. The hole injection layer 140 may have a function of improving the interface characteristics between the first electrode 110 and the hole transport layer 150 and may be selected as a material with appropriate conductivity. The hole injection layer 140 may include a compound, such as MTDATA, CuPc, TCTA, HATCN, TDAPB, PEDOT / PSS, or N1,N1′-([1,1′-biphenyl]-4,4′-diyl)bis(N1,N4,N4-triphenylbenzene-1,4-diamine), preferably, N1,N1′-([1,1′-biphenyl]-4,4′-diyl)bis(N1,N4,N4-triphenylbenzene-1,4-diamine), but is not limited thereto.

[0124] The hole transport layer 150 may be positioned adjacent the emission layer between the first electrode 110 and the emission layer 160. The hole transport layer 150 may include a compound, such as TPD, NPB, CBP, N-(biphenyl-4-yl)-9,9-dimethyl-N-((4-9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine, or (N-biphenyl-4-yl)-N-(((4-9-phenyl-9H-carbazol-3-yl)phenyl)biphenyl)-4-amine, preferably, NPB, but is not limited thereto.

[0125] According to one embodiment of the present disclosure, the emission layer 160 may be formed by being doped with the organometallic compound represented by Chemical Formula 1 as the dopant 160′ to increase the luminous efficiency and the like of the hosts 160″ and 160′″ and the element, and the dopant 160′ may be used as a material that emits light of green or red and for example, used as a green phosphorescent material.

[0126] According to one embodiment of the present disclosure, a doping concentration of the dopant 160′ may be adjusted in the range of 1 to 30 wt % based on the total weight of the two types of hosts 160″ and 160′″ and is not limited thereto, but for example, the doping concentration may be 2 to 20 wt %, for example, 3 to 15 wt %, for example, 5 to 10 wt %, for example, 3 to 8 wt %, for example, 2 to 7 wt %, for example, 5 to 7 wt %, and for example, 5 to 6 wt %.

[0127] According to one embodiment of the present disclosure, a mixing ratio of the two types of hosts 160″ and 160′″ is not particularly limited, and the host 160″, which is the compound represented by Chemical Formula 2, may have the hole transport characteristics and the host 160′″, which is the compound represented by Chemical Formula 3, may have the electron transport characteristics. Therefore, when the two types of hosts are mixed, it is possible to increase the lifetime characteristics, and the mixing ratio of the two types of hosts may be adjusted appropriately. Therefore, the mixing ratio of the two hosts in which the compound represented by Chemical Formula 2 and the compound represented by Chemical Formula 3 are mixed is not particularly limited, and the ratio (based on the weight) of the compound represented by Chemical Formula 2 and the compound represented by Chemical Formula 3 may be, for example, in the range of 1:9 to 9:1, for example, 2:8, for example, 3:7, for example, 4:6, for example, 5:5, for example, 6:4, for example 7:3, and for example, 8:2.

[0128] In addition, the electron transport layer 170 and the electron injection layer 180 may be sequentially stacked between the emission layer 160 and the second electrode 120. A material of the electron transport layer may exhibit high electron mobility, and electrons may be stably supplied to the emission layer through smooth electron transport.

[0129] For example, the material of the electron transport layer 170 is used in the art and may include, for example, a compound, such as Alg3(tris(8-hydroxyquinolino)aluminum), Liq(8-hydroxyquinolinolatolithium), PBD(2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole), TAZ(3-(4-biphenyl)4-phenyl-5-tert-butylphenyl-1,2,4-triazole), spiro-PBD, BAlq(bis(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminium), SAlq, TPBi(2,2′,2-(1,3,5-benzenetriyl)-tris(1-phenyl-1-H-benzimidazole), oxadiazole, triazole, phenanthroline, benzoxazole, benzothiazole, or 2-(4-(9,10-di(naphthalen-2-yl)anthracen-2-yl)phenyl)-1-phenyl-1H-benzo[d]imidazole, preferably 2-(4-(9,10-di(naphthalen-2-yl)anthracen-2-yl)phenyl)-1-phenyl-1H-benzo[d]imidazole, but is not limited thereto.

[0130] The electron injection layer 180 serves to allow electrons to be smoothly injected, and a material of the electron injection layer is used in the art and may include, for example, Alq3(tris(8-hydroxyquinolino)aluminum), PBD, TAZ, spiro-PBD, BAlq, SAlq, or the like, but is not limited thereto. Alternatively, the electron injection layer 180 may be made of a metal compound, and the metal compound may include, for example, Liq, LiF, NaF, KF, RbF, CsF, FrF, BeF2, MgF2, CaF2, SrF2, BaF2, RaF2, or the like, but is not limited thereto.

[0131] The organic light emitting diode according to the present disclosure may be a white organic light emitting diode with a tandem structure. In the tandem organic light emitting diode according to one embodiment of the present disclosure, a single light emitting stack (or a light emitting part) may be formed in a structure in which two or more light emitting stacks (or light emitting parts) are connected by the charge generation layer CGL. The organic light emitting diode may include the first and second electrodes facing each other on the substrate and two or more light emitting stacks (light emitting parts) stacked between the first and second electrodes and including an emission layer so as to emit light in a specific wavelength band. The plurality of light emitting stacks (light emitting parts) may be applied to emit the same color or different colors. In addition, one light emitting stack (light emitting part) may include one or more emission layers, and the plurality of light emitting layers may be light emitting layers of the same color or different colors.

[0132] In this case, one or more of the emission layers included in the plurality of light emitting parts may include the organometallic compound represented by Chemical Formula 1 according to the present disclosure as a dopant material. The plurality of light emitting parts in the tandem structure may be connected to the charge generation layer CGL formed of an N-type charge generation layer and a P-type charge generation layer.

[0133] FIGS. 2 and 3, which are exemplary embodiments of the present disclosure, are cross-sectional views schematically showing organic light emitting diodes in tandem structures having two light emitting parts and three light emitting parts, respectively.

[0134] As shown in FIG. 2, the organic light emitting diode 100 of the present disclosure includes the first electrode 110 and the second electrode 120 that face each other, and an intermediate layer 230 positioned between the first electrode 110 and the second electrode 120. The intermediate layer 230 includes a first light emitting part ST1 positioned between the first electrode 110 and the second electrode 120 and including a first emission layer 261, a second light emitting part ST2 positioned between the first light emitting part ST1 and the second electrode 120 and including a second emission layer 262, and the charge generation layer CGL positioned between the first and second light emitting parts ST1 and ST2. The charge generation layer CGL may include an N-type charge generation layer 291 and a P-type charge generation layer 292. One or more of the first emission layer 261 and the second emission layer 262 may include the organometallic compound represented by Chemical Formula 1 according to the present disclosure as a dopant 262′. For example, as shown in FIG. 2, the second emission layer 262 of the second light emitting part ST2 may contain the compound 262′ represented by Chemical Formula 1 as the dopant, a compound 262″ represented by Chemical Formula 2 as the hole transport type host, and a compound 262′″ represented by Chemical Formula 3 as an electron transport type host. Although not shown in FIG. 2, each of the first and second light emitting parts ST1 and ST2 may further include an additional emission layer in addition to the first emission layer 261 and the second emission layer 262. The contents described above in relation to the hole transport layer 150 of FIG. 1 may be applied to the first hole transport layer 251 and the second hole transport layer 252 of FIG. 2 in the same or similar manner. In addition, the contents described above in relation to the electron transport layer 170 of FIG. 1 may be applied to the first electron transport layer 271 and the second electron transport layer 272 of FIG. 2 in the same or similar manner.

[0135] As shown in FIG. 3, the organic light emitting diode 100 of the present disclosure includes the first electrode 110 and the second electrode 120 that face each other, and an intermediate layer 330 positioned between the first electrode 110 and the second electrode 120. The intermediate layer 330 includes the first light emitting part ST1 positioned between the first electrode 110 and the second electrode 120 and including the first emission layer 261, the second light emitting part ST2 including the second emission layer 262, a third light emitting part ST3 including a third emission layer 263, a first charge generation layer CGL1 positioned between the first and second light emitting parts ST1 and ST2, and a second charge generation layer CGL2 positioned between the second and third light emitting parts ST2 and ST3. The first and second charge generation layers CGL1 and CGL2 may include the N-type charge generation layers 291 and 293 and the P-type charge generation layers 292 and 294, respectively. One or more of the first emission layer 261, the second emission layer 262, and the third emission layer 263 may include the organometallic compound represented by Chemical Formula 1 according to the present disclosure as the dopant. For example, as shown in FIG. 3, the second emission layer 262 of the second light emitting part ST2 may contain the compound represented by Chemical Formula 1 as the dopant 262′, the compound represented by Chemical Formula 2 as the hole transport type host 262″, and the compound represented by Chemical Formula 3 as the electron transport type host 262′″. Although not shown in FIG. 3, in addition to the first emission layer 261, the second emission layer 262, and the third emission layer 263, each of the first, second, and third light emitting parts ST1, ST2, and ST3 may be formed as a plurality of emission layers by including an additional emission layer. The contents described above in relation to the hole transport layer 150 of FIG. 1 may be applied to the first hole transport layer 251, the second hole transport layer 252, and the third hole transport layer 253 of FIG. 3 in the same or similar manner. In addition, the contents described above in relation to the electron transport layer 170 of FIG. 1 may be applied to the first electron transport layer 271, the second electron transport layer 272, and the third electron transport layer 273 of FIG. 3 in the same or similar manner.

[0136] Furthermore, the organic light emitting diode according to one embodiment of the present disclosure may include a tandem structure in which four or more light emitting parts and three or more charge generation layers are disposed between the first electrode and the second electrode.

[0137] The organic light emitting diode according to the present disclosure may be used in organic light emitting diode display devices and lighting devices using organic light emitting diodes. In one embodiment, FIG. 4 is a cross-sectional view schematically showing an organic light emitting diode display device to which the organic light emitting diode according to an exemplary embodiment of the present disclosure is applied.

[0138] As shown in FIG. 4, an organic light emitting diode display device 3000 may include a substrate 3010, an organic light emitting diode 4000, and an encapsulation film 3900 covering the organic light emitting diode 4000. On the substrate 3010, a driving thin film transistor Td, which is a driving element, and the organic light emitting diode 4000 connected to the driving thin film transistor Td are positioned.

[0139] Although not explicitly shown in FIG. 4, on the substrate 3010, a gate line and a data line that intersect each other to define a pixel area, a power line spaced apart from any one of the gate line and the data line and extending in parallel, a switching thin film transistor connected to the gate line and the data line, and a storage capacitor connected to the power line and one electrode of the switching thin film transistor are further formed.

[0140] The driving thin film transistor Td is connected to the switching thin film transistor and includes a semiconductor layer 3100, a gate electrode 3300, a source electrode 3520, and a drain electrode 3540.

[0141] The semiconductor layer 3100 may be formed on the substrate 3010 and may be made of an oxide semiconductor material or polycrystalline silicon. When the semiconductor layer 3100 is made of the oxide semiconductor material, a light blocking pattern (not shown) may be formed under the semiconductor layer 3100, and the light blocking pattern prevents light incident on the semiconductor layer 3100, thereby preventing the degradation of the semiconductor layer 3100 caused by the light. Alternatively, the semiconductor layer 3100 may be made of polycrystalline silicon, and in this case, both edges of the semiconductor layer 3100 may be doped with impurities.

[0142] A gate insulating film 3200 made of an insulating material is formed on the entire surface of the substrate 3010 as well as the semiconductor layer 3100. The gate insulating film 3200 may be made of an inorganic insulating material, such as silicon oxide or silicon nitride.

[0143] A gate electrode 3300 made of a conductive material, such as a metal, is formed above the gate insulating film 3200 to correspond to the center of the semiconductor layer 3100. The gate electrode 3300 is connected to the switching thin film transistor.

[0144] An interlayer insulating film 3400 made of an insulating material is formed on the entire surface of the substrate 3010 as well as the gate electrode 3300. The interlayer insulating film 3400 may be made of an inorganic insulating material, such as silicon oxide or silicon nitride, or made of an organic insulating material, such as benzocyclobutene or photo-acryl.

[0145] The interlayer insulating film 3400 has first and second semiconductor layer contact holes 3420 and 3440 that expose both sides of the semiconductor layer 3100. The first and second semiconductor layer contact holes 3420 and 3440 are positioned to be spaced apart from the gate electrode 3300 at both sides of the gate electrode 3300.

[0146] The source electrode 3520 and the drain electrode 3540 made of the conductive material, such as a metal, are formed on the interlayer insulating film 3400. The source electrode 3520 and the drain electrode 3540 are positioned to be spaced apart from each other with respect to the gate electrode 3300 and are in contact with both sides of the semiconductor layer 3100 through the first and second semiconductor layer contact holes 3420 and 3440, respectively. The source electrode 3520 is connected to the power line (not shown).

[0147] The semiconductor layer 3100, the gate electrode 3300, the source electrode 3520, and the drain electrode 3540 form the driving thin film transistor Td, and the driving thin film transistor Td has a coplanar structure in which the gate electrode 3300, the source electrode 3520, and the drain electrode 3540 are positioned above the semiconductor layer 3100.

[0148] Alternatively, the driving thin film transistor Td may have an inverted staggered structure in which the gate electrode is positioned under the semiconductor layer and the source electrode and the drain electrode are positioned above the semiconductor layer. In this case, the semiconductor layer may be made of amorphous silicon. Meanwhile, the switching thin film transistor (not shown) may have substantially the same structure as the driving thin film transistor Td.

[0149] Meanwhile, the organic light emitting diode display device 3000 may include a color filter 3600 that absorbs light generated by the organic light emitting diode 4000. For example, the color filter 3600 may absorb light of red (R), green (G), blue (B), and white (W). In this case, red, green, and blue color filter patterns that absorb light may be formed separately in each pixel area, and each of the color filter patterns may be disposed to overlap each intermediate layer 4300 of the organic light emitting diode 4000 that emits light in a wavelength band to be absorbed. By adopting the color filter 3600, the organic light emitting diode display device 3000 can implement full-color.

[0150] For example, when the organic light emitting diode display device 3000 is a bottom-emission type, the color filter 3600 that absorbs light may be positioned above the interlayer insulating film 3400 corresponding to the organic light emitting diode 4000. In an exemplary embodiment, when the organic light emitting diode display device 3000 is a top-emission type, the color filter may be positioned above the organic light emitting diode 4000, that is, above a second electrode 4200. For example, the color filter 3600 may be formed to have a thickness of 2 to 5 μm.

[0151] Meanwhile, a planarization layer 3700 with a drain contact hole 3720 that exposes the drain electrode 3540 of the driving thin film transistor Td is formed to cover the driving thin film transistor Td.

[0152] On the planarization layer 3700, a first electrode 4100 connected to the drain electrode 3540 of the driving thin film transistor Td through the drain contact hole 3720 is formed separately in each pixel area.

[0153] The first electrode 4100 may be an anode and may be made of a conductive material with a relatively high work function value. For example, the first electrode 4100 may be made of a transparent conductive material, such as ITO, IZO, or ZnO.

[0154] Meanwhile, when the organic light emitting diode display device 3000 is a top-emission type, a reflective electrode or a reflective layer may be further formed under the first electrode 4100. For example, the reflective electrode or the reflective layer may be made of any one of aluminum (Al), silver (Ag), nickel (Ni), or an aluminum-palladium-copper (APC) alloy.

[0155] A bank layer 3800 covering an edge of the first electrode 4100 is formed on the planarization layer 3700. The bank layer 3800 exposes the center of the first electrode 4100 corresponding to the pixel area.

[0156] The intermediate layer 4300 is formed on the first electrode 4100, and optionally, the organic light emitting diode 4000 may have a tandem structure, and regarding the tandem structure, reference is made to FIGS. 2 to 4 showing the exemplary embodiment of the present disclosure and the above description thereof.

[0157] The second electrode 4200 is formed above the substrate 3010 on which the intermediate layer 4300 is formed. The second electrode 4200 may be positioned on the entire surface of the display area and may be made of a conductive material with a relatively low work function value to be used as a cathode. For example, the second electrode 4200 may be made of any one of aluminum (Al), magnesium (Mg), and aluminum-magnesium alloy (Al—Mg).

[0158] The first electrode 4100, the intermediate layer 4300, and the second electrode 4200 form the organic light emitting diode 4000.

[0159] On the second electrode 4200, the encapsulation film 3900 is formed to prevent the permeation of external moisture into the organic light emitting diode 4000. Although not explicitly shown in FIG. 4, the encapsulation film 3900 may have a triple-layer structure in which a first inorganic layer, an intermediate layer, and a second inorganic layer are sequentially stacked, but is not limited thereto.

[0160] Hereinafter, examples of the present disclosure will be described. However, the following examples are only examples of the present disclosure, and the present disclosure is not limited thereto.Example 1

[0161] A glass substrate coated with a thin film of ITO in a thickness of 1,000 Å was washed, then ultrasonic cleaned with a solvent, such as isopropyl alcohol, acetone, and methanol, and dried.

[0162] After HI-1 as a hole injection material was thermally deposited in vacuum in a thickness of 100 nm above the provided ITO transparent electrode, HT-1 as a hole transport material was thermally deposited in vacuum in a thickness of 350 nm. Then, in an emission layer, GD1 as a dopant and a mixture of GHH1 and GEH1 as hosts (GHH1:GEH1=7:3, based on the weight) were used, a doping concentration of the dopant was 10%, and the thickness of the emission layer was 400 nm. Subsequently, after ET-1 and Liq compounds as materials for an electron transport layer and an electron injection layer, respectively, were thermally deposited in vacuum, aluminum of 100 nm was deposited to form a cathode, and thus an organic light emitting diode was manufactured.

[0163] The materials used in Example 1 are as follows.

[0164] In the above materials, HI-1 is NPNPB, and ET-1 is ZADN.Comparative Examples 1 to 5 and Examples 2 to 200

[0165] Organic light emitting diodes of Comparative Examples 1 to 5 and Examples 2 to 200 were manufactured in the same manner as Example 1, except that the dopant materials and host materials shown in Tables 1 to 15 below were used in Example 1. Comparative Examples 1 to 5 each used the type of “CBP” with a structure below as the host of the emission layer.Experimental Example

[0166] The organic light emitting diodes manufactured in Examples 1 to 200 and Comparative Examples 1 to 5 were each connected to an external power source, and element characteristics were evaluated at room temperature using a current source and a photometer.

[0167] Specifically, a driving voltage (V), external quantum efficiency (EQE), and lifetime (LT95) characteristics were measured with a current of 10 mA / cm2, and measured values of Examples 1 to 200 were calculated as relative values (percentage, %) for any one of Comparative Examples 1 to 5, and the results are shown in Tables 1 to 15 below.

[0168] LT95 lifetime indicates the time it takes for an organic light emitting diode to lose 5% of an initial brightness. LT95 is the most difficult element characteristic specification to meet, and whether an image burn-in phenomenon occurs in an organic light emitting diode is determined using LT95.TABLE 1EQELT95driving(%,(%,emission layervoltagerelativerelativedopanthost(V)value)value)ComparativeGD1CBP4.30100100Example 1Example 1GD1GHH1GEH14.20133137Example 2GD1GHH1GEH24.20132134Example 3GD1GHH1GEH34.20122135Example 4GD1GHH1GEH44.20124131Example 5GD1GHH1GEH54.19128135Example 6GD1GHH1GEH64.29127134Example 7GD1GHH1GEH74.21122139Example 8GD1GHH1GEH84.22118133Example 9GD1GHH1GEH94.20121131Example 10GD1GHH1GEH104.28123132Example 11GD1GHH2GEH14.06131134Example 12GD1GHH2GEH24.12128130Example 13GD1GHH2GEH34.13122132Example 14GD1GHH2GEH44.13124128Example 15GD1GHH2GEH54.12127130TABLE 2EQELT95driving(%,(%,emission layervoltagerelativerelativedopanthost(V)value)value)ComparativeGD1CBP4.30100100Example 1Example 16GD1GHH2GEH64.11126131Example 17GD1GHH2GEH74.17118133Example 18GD1GHH2GEH84.07117129Example 19GD1GHH2GEH94.17119132Example 20GD1GHH2GEH104.22123130Example 21GD1GHH3GEH14.22124129Example 22GD1GHH3GEH24.15125127Example 23GD1GHH3GEH34.12116127Example 24GD1GHH3GEH44.19121122Example 25GD1GHH3GEH54.20121125Example 26GD1GHH3GEH64.17123125Example 27GD1GHH3GEH74.26113130Example 28GD1GHH3GEH84.11111125Example 29GD1GHH3GEH94.14116126Example 30GD1GHH3GEH104.29119125TABLE 3EQELT95driving(%,(%,emission layervoltagerelativerelativedopanthost(V)value)value)ComparativeGD1CBP4.30100100Example 1Example 31GD1GHH4GEH14.16127131Example 32GD1GHH4GEH24.20125133Example 33GD1GHH4GEH34.27120130Example 34GD1GHH4GEH44.33122124Example 35GD1GHH4GEH54.22123127Example 36GD1GHH4GEH64.28125125Example 37GD1GHH4GEH74.24114132Example 38GD1GHH4GEH84.20112130Example 39GD1GHH4GEH94.22118128Example 40GD1GHH4GEH104.21120128Example 41GD1GHH5GEH14.19129119Example 42GD1GHH5GEH24.08126118Example 43GD1GHH5GEH34.13117116Example 44GD1GHH5GEH44.14122114Example 45GD1GHH5GEH54.18126115TABLE 4EQELT95driving(%,(%,emission layervoltagerelativerelativedopanthost(V)value)value)ComparativeGD1CBP4.30100100Example 1Example 46GD1GHH5GEH64.17126114Example 47GD1GHH5GEH74.25115120Example 48GD1GHH5GEH84.12112120Example 49GD1GHH5GEH94.09119118Example 50GD1GHH5GEH104.21120114Example 51GD1GHH6GEH14.29122127Example 52GD1GHH6GEH24.28123127Example 53GD1GHH6GEH34.31116125Example 54GD1GHH6GEH44.33119122Example 55GD1GHH6GEH54.24118125Example 56GD1GHH6GEH64.27119126Example 57GD1GHH6GEH74.36112128Example 58GD1GHH6GEH84.34112125Example 59GD1GHH6GEH94.33115126Example 60GD1GHH6GEH104.32114122TABLE 5EQELT95driving(%,(%,emission layervoltagerelativerelativedopanthost(V)value)value)ComparativeGD1CBP4.30100100Example 1Example 61GD1GHH7GEH14.13128123Example 62GD1GHH7GEH24.10124124Example 63GD1GHH7GEH34.06117120Example 64GD1GHH7GEH44.02118116Example 65GD1GHH7GEH54.15121122Example 66GD1GHH7GEH64.14123120Example 67GD1GHH7GEH74.11115123Example 68GD1GHH7GEH84.07111122Example 69GD1GHH7GEH94.09115121Example 70GD1GHH7GEH104.06117119Example 71GD1GHH8GEH14.24128124Example 72GD1GHH8GEH24.24123126Example 73GD1GHH8GEH34.25118124Example 74GD1GHH8GEH44.27121121Example 75GD1GHH8GEH54.23122124TABLE 6EQELT95driving(%,(%,emission layervoltagerelativerelativedopanthost(V)value)value)ComparativeGD1CBP4.30100100Example 1Example 76GD1GHH8GEH64.38125122Example 77GD1GHH8GEH74.33116127Example 78GD1GHH8GEH84.20112124Example 79GD1GHH8GEH94.23117124Example 80GD1GHH8GEH104.29119119Example 81GD1GHH9GEH14.28126121Example 82GD1GHH9GEH24.24124120Example 83GD1GHH9GEH34.26120116Example 84GD1GHH9GEH44.24123114Example 85GD1GHH9GEH54.32123117Example 86GD1GHH9GEH64.25126117Example 87GD1GHH9GEH74.39116121Example 88GD1GHH9GEH84.29113118Example 89GD1GHH9GEH94.29119119Example 90GD1GHH9GEH104.34120116TABLE 7EQELT95driving(%,(%,emission layervoltagerelativerelativedopanthost(V)value)value)ComparativeGD1CBP4.30100100Example 1Example 91GD1GHH10GEH14.37123117Example 92GD1GHH10GEH24.27119114Example 93GD1GHH10GEH34.39114113Example 94GD1GHH10GEH44.36118111Example 95GD1GHH10GEH54.32119115Example 94GD1GHH10GEH64.35119115Example 97GD1GHH10GEH74.38111116Example 98GD1GHH10GEH84.25108112Example 99GD1GHH10GEH94.39113115Example 100GD1GHH10GEH104.37117111TABLE 8EQELT95driving(%,(%,emission layervoltagerelativerelativedopanthost(V)value)value)ComparativeGD2CBP4.31100100Example 2Example 101GD2GHH1GEH14.27132138Example 102GD2GHH1GEH24.30132136Example 103GD2GHH1GEH34.21125134Example 104GD2GHH1GEH44.17128131Example 105GD2GHH1GEH54.12130133Example 106GD2GHH2GEH14.13129133Example 107GD2GHH2GEH24.18129134Example 108GD2GHH2GEH34.20119135Example 109GD2GHH2GEH44.10125128Example 110GD2GHH2GEH54.23128130Example 111GD2GHH3GEH14.21127128Example 112GD2GHH3GEH24.19121129Example 113GD2GHH3GEH34.27115125Example 114GD2GHH3GEH44.15121125Example 115GD2GHH3GEH54.19122124TABLE 9EQELT95driving(%,(%,emission layervoltagerelativerelativedopanthost(V)value)value)ComparativeGD2CBP4.31100100Example 2Example 116GD2GHH4GEH14.19127132Example 117GD2GHH4GEH24.23126130Example 118GD2GHH4GEH34.14117129Example 119GD2GHH4GEH44.15122125Example 120GD2GHH4GEH54.17126127Example 121GD2GHH5GEH14.06128120Example 122GD2GHH5GEH24.15128117Example 123GD2GHH5GEH34.17118120Example 124GD2GHH5GEH44.16122115Example 125GD2GHH5GEH54.07124117TABLE 10EQELT95driving(%,(%,emission layervoltagerelativerelativedopanthost(V)value)value)ComparativeGD3CBP4.32100100Example 3Example 126GD3GHH1GEH14.25134137Example 127GD3GHH1GEH24.14131137Example 128GD3GHH1GEH34.16123135Example 129GD3GHH1GEH44.15127131Example 130GD3GHH1GEH54.17127135Example 131GD3GHH2GEH14.14129135Example 132GD3GHH2GEH24.05128134Example 133GD3GHH2GEH34.07120132Example 134GD3GHH2GEH44.14125129Example 135GD3GHH2GEH54.10126131Example 136GD3GHH3GEH14.12125128Example 137GD3GHH3GEH24.18124129Example 138GD3GHH3GEH34.17115128Example 139GD3GHH3GEH44.12122122Example 140GD3GHH3GEH54.14123125TABLE 11EQELT95driving(%,(%,emission layervoltagerelativerelativedopanthost(V)value)value)ComparativeGD3CBP4.32100100Example 3Example 141GD3GHH4GEH14.13128131Example 142GD3GHH4GEH24.06126128Example 143GD3GHH4GEH34.22119129Example 144GD3GHH4GEH44.13122124Example 145GD3GHH4GEH54.25122127Example 146GD3GHH5GEH14.13130121Example 147GD3GHH5GEH24.04126117Example 148GD3GHH5GEH34.14118120Example 149GD3GHH5GEH44.18123113Example 150GD3GHH5GEH54.08124117TABLE 12EQELT95driving(%,(%,emission layervoltagerelativerelativedopanthost(V)value)value)ComparativeGD4CBP4.32100100Example 4Example 151GD4GHH1GEH14.22132136Example 152GD4GHH1GEH24.15131136Example 153GD4GHH1GEH34.18121133Example 154GD4GHH1GEH44.12126132Example 155GD4GHH1GEH54.24129132Example 156GD4GHH2GEH14.06132134Example 157GD4GHH2GEH24.11129131Example 158GD4GHH2GEH34.13122130Example 159GD4GHH2GEH44.18125129Example 160GD4GHH2GEH54.14127131Example 161GD4GHH3GEH14.11124129Example 162GD4GHH3GEH24.23126126Example 163GD4GHH3GEH34.15119125Example 164GD4GHH3GEH44.14119122Example 165GD4GHH3GEH54.19122124TABLE 13EQELT95driving(%,(%,emission layervoltagerelativerelativedopanthost(V)value)value)ComparativeGD4CBP4.32100100Example 4Example 166GD4GHH4GEH14.16125132Example 167GD4GHH4GEH24.18127129Example 168GD4GHH4GEH34.13119129Example 169GD4GHH4GEH44.20123125Example 170GD4GHH4GEH54.20122127Example 171GD4GHH5GEH14.11127121Example 172GD4GHH5GEH24.12128120Example 173GD4GHH5GEH34.15120118Example 174GD4GHH5GEH44.10122116Example 175GD4GHH5GEH54.09123115TABLE 14EQELT95driving(%,(%,emission layervoltagerelativerelativedopanthost(V)value)value)ComparativeGD5CBP4.32100100Example 5Example 176GD5GHH1GEH14.17131137Example 177GD5GHH1GEH24.21129134Example 178GD5GHH1GEH34.20122132Example 179GD5GHH1GEH44.10127130Example 180GD5GHH1GEH54.24128136Example 181GD5GHH2GEH14.14129133Example 182GD5GHH2GEH24.12129134Example 183GD5GHH2GEH34.11122130Example 184GD5GHH2GEH44.03126126Example 185GD5GHH2GEH54.12125132Example 186GD5GHH3GEH14.17125130Example 187GD5GHH3GEH24.15123127Example 188GD5GHH3GEH34.14118128Example 189GD5GHH3GEH44.19119122Example 190GD5GHH3GEH54.22122123TABLE 15EQELT95driving(%,(%,emission layervoltagerelativerelativedopanthost(V)value)value)ComparativeGD5CBP4.32100100Example 5Example 191GD5GHH4GEH14.21126131Example 192GD5GHH4GEH24.12126131Example 193GD5GHH4GEH34.17116129Example 194GD5GHH4GEH44.17121126Example 195GD5GHH4GEH54.13122128Example 196GD5GHH5GEH14.09128118Example 197GD5GHH5GEH24.10124118Example 198GD5GHH5GEH34.15120116Example 199GD5GHH5GEH44.18122113Example 200GD5GHH5GEH54.09126115As can be seen from the results of Tables 1 to 15, it could be seen that the organic light emitting diodes that adopted the organometallic compound satisfying the structure represented by Chemical Formula 1 of the present disclosure used in Examples 1 to 200 as the dopant of the emission layer and adopted the mixture of the compound represented by Chemical Formula 2 and the compound represented by Chemical Formula 3 as the hosts had low driving voltages and increased external quantum efficiency (EQE) and lifetime (LT95) compared to the organic light emitting diodes of Comparative Examples 1 to 5 that used the single material as the host.In the organic light emitting diode according to the present disclosure, by adopting the organometallic compound represented by Chemical Formula 1 as the phosphorous dopant and adopting a mixture of a compound represented by Chemical Formula 2 and a compound represented by Chemical Formula 3 as the phosphorous host, it is possible to improve the efficiency and lifetime characteristics and secure the low-power characteristics by decreasing the driving voltage.The effects obtainable from the present disclosure are not limited to the above-described effects, and other effects that are not mentioned will be able to be clearly understood by those skilled in the art to which the present disclosure pertains from the following description.Although the embodiments of the present specification have been described in more detail with reference to the accompanying drawings, the present specification is not necessarily limited to these embodiments, and various modifications may be carried out without departing from the technical spirit of the present specification. Therefore, the embodiments disclosed in the present specification are not intended to limit the technical spirit of the present specification, but is intended to describe the same, and the scope of the technical spirit of the present specification is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative and not restrictive in all aspects. The scope of the present specification should be construed according to the appended claims, and all technical spirits within the equivalent range should be construed as being included in the scope of the present specification.DESCRIPTION OF REFERENCE NUMERALS100, 4000: organic light emitting diode110, 4100: first electrode120, 4200: second electrode130, 230, 330, 4300: intermediate layer140: hole injection layer150: hole transport layer, 251: first hole transport layer, 252: second hole transport layer, 253: third hole transport layer160: emission layer, 261: first emission layer, 262: second emission layer, 263: third emission layer160′, 262′: dopant160″, 262″: hole transport type host160′″, 262′‘’: electron transport type host170: electron transport layer, 271: first electron transport layer, 272: second electron transport layer, 273: third electron transport layer180: electron injection layer

[0185] 3000: organic light emitting diode display device

[0186] 3010: substrate

[0187] 3100: semiconductor layer

[0188] 3200: gate insulating film

[0189] 3300: gate electrode

[0190] 3400: interlayer insulating film

[0191] 3420, 3440: first and second semiconductor layer contact holes

[0192] 3520: source electrode

[0193] 3540: drain electrode

[0194] 3600: color filter

[0195] 3700: planarization layer

[0196] 3720: drain contact hole

[0197] 3800: bank layer

[0198] 3900: encapsulation film

Claims

1. An organic light emitting diode comprising:a first electrode;a second electrode facing the first electrode; andan intermediate layer disposed between the first electrode and the second electrode,wherein the intermediate layer includes an emission layer, and the emission layer includes a dopant material and a host material,the dopant material includes an organometallic compound represented by Chemical Formula 1 below, andthe host material includes a mixture of a compound represented by Chemical Formula 2 below and a compound represented by Chemical Formula 3 below:in Chemical Formula 1,X is one selected from oxygen (O), sulfur (S), and selenium (Se),R1 to R6 are, each independently, one selected from deuterium, halogen, halide, an alkyl group, a cycloalkyl group, a heteroalkyl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group, a silyl group, an alkenyl group, a cycloalkenyl group, a heteroalkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an acyl group, a carboxylic acid group, a nitrile group, an isonitrile group, a sulfanyl group, a phosphino group, a group formed by connecting two or more of the groups mentioned above, and combinations thereof,R7 and R8 are, each independently, one selected from hydrogen, deuterium, a C1-C6 linear alkyl group, a C3-C6 branched alkyl group, and a C3-C6 cycloalkyl group,optionally, at least one of R1 to R8 are partially or entirely deuterated,a and b are, each independently, an integer from 0 to 4, and when a and b are each independently an integer from 2 to 4, a plurality of R1 or a plurality of R2 are the same or different from each other,c and f are, each independently, an integer from 0 to 3, and when c and f are each independently an integer of 2 or 3, a plurality of R3 or a plurality of R6 are the same or different from each other,d is an integer from 0 to 2, and when d is an integer of 2, a plurality of R4 are the same or different from each other,e is an integer from 0 to 5, and when e is an integer from 2 to 5, a plurality of R5 are the same or different from each other, andm is an integer from 1 to 8, and n is an integer from 0 to 2,in Chemical Formula 2,R9 are, each independently, one selected from hydrogen, deuterium, an alkyl group, an alkoxy group, a thioalkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aryl group, an arylamino group, a heteroaryl group, and a group formed by connecting two or more of the groups mentioned above, or two of R9 bond to each other to form a spirofluorene,R10 and R11 are, each independently, one selected from hydrogen, deuterium, an alkyl group, an alkoxy group, a thioalkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an amino group, an arylamino group, an aryl group, a heteroaryl group, and a group formed by connecting two or more of the groups mentioned above,L1 is one selected from a single bond, a phenylene group, a biphenylene group, a divalent naphthalene group, a divalent dibenzofuran group, and a divalent dibenzothiophene group,Ar1 and Ar2 are, each independently, one selected from an aryl group, an arylamino group, a heteroaryl group, and a group formed by connecting two or more of the groups mentioned above, and when Ar1 and Ar2 are the group formed by connecting two or more of the groups mentioned above, the two or more of the groups are connected via a single bond, an alkylene group, —O—, or a carbonyl group, andoptionally, at least one hydrogen of each of Ar1 and / or Ar2 is substituted with a substituent R12, and R12 is, each independently, at least one selected from the group consisting of deuterium, halogen, an alkyl group, an alkoxy group, a thioalkyl group, an alkylsilyl group and a group formed by connecting two or more of the groups mentioned above,in Chemical Formula 3,Ar3, Ar4, Ar5, and Ar6 are, each independently, one selected from hydrogen, deuterium, halogen, a C1-C30 alkyl group, a C6-C50 aryl group, a C3-C50 heteroaryl group, and a C3-C30 cycloalkyl group,L2 is one selected from a single bond, a C6-C50 arylene group, and a C5-C50 heteroarylene group,Y is nitrogen (N) or CH,g and h are, each independently, integers from 1 to 4,when g is 2 or more, any two of a plurality of Ar5 that are adjacent are optionally bonded to form a fused ring structure of a monocyclic or polycyclic, C6-C30 aromatic group or C3-C30 heteroaromatic group, and one or more of hydrogens of the fused ring structure are optionally substituted with a substituent selected from deuterium, a C1-C10 alkyl group, a C6-C20 aryl group, and a C3-C20 heteroaryl group, andwhen h is 2 or more, any two of a plurality of Ar6 that are adjacent are optionally bonded to form a fused ring structure of a monocyclic or polycyclic, C6-C30 aromatic group or C3-C30 heteroaromatic group, one or more of hydrogens of the fused ring structure are optionally substituted with a substituent R13, and R13 is at least one selected from deuterium, a C1-C10 alkyl group, a C6-C20 aryl group, and a C3-C20 heteroaryl group.

2. The organic light emitting diode of claim 1, wherein n in Chemical Formula 1 is 2.

3. The organic light emitting diode of claim 1, wherein X in Chemical Formula 1 is oxygen (O).

4. The organic light emitting diode of claim 1, wherein m is an integer of 1 to 3.

5. The organic light emitting diode of claim 1, wherein the organometallic compound represented by Chemical Formula 1 is one of Compounds GD1 to GD20 below:

6. The organic light emitting diode of claim 1, wherein L1 in Chemical Formula 2 is one selected from a single bond or a phenylene group.

7. The organic light emitting diode of claim 1, wherein the compound represented by Chemical Formula 2 is one of Compounds GHH1 to GHH30 below:

8. The organic light emitting diode of claim 1, wherein Y in Chemical Formula 3 is nitrogen (N).

9. The organic light emitting diode of claim 1, wherein Ar3 and Ar4 in Chemical Formula 3 are, each independently, one selected from a C6-C50 aryl group or a C3-C50 heteroaryl group.

10. The organic light emitting diode of claim 1, wherein Ar3 and Ar4 in Chemical Formula 3 are, each independently, one selected from a phenyl group, a biphenyl group, a naphthyl group, a dibenzofuran group, a carbazole group, an indole group, a dibenzothiophene group, a chrysene group, a benzochrysene group, a phenanthrene group, a benzophenanthrene group, a benzonaphthothiophene group, and a benzonaphthofuran group.

11. The organic light emitting diode of claim 1, wherein the compound represented by Chemical Formula 3 is one of Compounds GEH1 to GEH30 below:

12. The organic light emitting diode of claim 1, wherein the intermediate layer further includes any one or more among a hole injection layer, a hole transport layer, a hole transport auxiliary layer, an electron blocking layer, an electron transport layer, and an electron injection layer.

13. An organic light emitting diode comprising:a first electrode;a second electrode facing the first electrode; andone or more light emitting parts positioned between the first electrode and the second electrode,wherein at least one of the light emitting parts includes a green phosphorescent light emission layer,the green phosphorescent light emission layer includes a dopant material and a host material,the dopant material includes an organometallic compound represented by Chemical Formula 1 below, andthe host material includes a compound represented by Chemical Formula 2 below and a compound represented by Chemical Formula 3 below:in Chemical Formula 1,X is one selected from oxygen (O), sulfur (S), and selenium (Se),R1 to R6 are, each independently, one selected from deuterium, halogen, halide, an alkyl group, a cycloalkyl group, a heteroalkyl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group, a silyl group, an alkenyl group, a cycloalkenyl group, a heteroalkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an acyl group, a carboxylic acid group, a nitrile group, an isonitrile group, a sulfanyl group, a phosphino group, a group formed by connecting two or more of the groups mentioned above, and combinations thereof,R7 and R8 are, each independently, one selected from hydrogen, deuterium, a C1-C6 linear alkyl group, a C3-C6 branched alkyl group, and a C3-C6 cycloalkyl group,optionally, at least one of R1 to R8 are partially or entirely deuterated,a and b are, each independently, an integer from 0 to 4, and when a and b are each independently an integer from 2 to 4, a plurality of R1 or a plurality of R2 are the same or different from each other,c and f are, each independently, an integer from 0 to 3, and when c and f are each independently an integer of 2 or 3, a plurality of R3 or a plurality of R6 are the same or different from each other,d is an integer from 0 to 2, and when d is an integer of 2, a plurality of R4 are the same or different from each other,e is an integer from 0 to 5, and when e is an integer from 2 to 5, a plurality of R5 are the same or different from each other, andm is an integer from 1 to 8, and n is an integer from 0 to 2,in Chemical Formula 2,R9 are, each independently, one selected from hydrogen, deuterium, an alkyl group, an alkoxy group, a thioalkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aryl group, an arylamino group, a heteroaryl group, and a group formed by connecting two or more of the groups mentioned above, or two of R9 bond to each other to form a spirofluorene,R10 and R11 are, each independently, one selected from hydrogen, deuterium, an alkyl group, an alkoxy group, a thioalkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an amino group, an arylamino group, an aryl group, a heteroaryl group, and a group formed by connecting two or more of the groups mentioned above,L1 is one selected from a single bond, a phenylene group, a biphenylene group, a divalent naphthalene group, a divalent dibenzofuran group, and a divalent dibenzothiophene group,Ar1 and Ar2 are, each independently, one selected from an aryl group, an arylamino group, a heteroaryl group, and a group formed by connecting two or more of the groups mentioned above, and when Ar1 and Ar2 are the group formed by connecting two or more of the groups mentioned above, the two or more of the groups are connected via a single bond, an alkylene group, —O—, or a carbonyl group, andoptionally, at least one hydrogen of each of Ar1 and / or Ar2 is substituted with a substituent R12, and R12 is, each independently, at least one selected from the group consisting of deuterium, halogen, an alkyl group, an alkoxy group, a thioalkyl group, an alkylsilyl group and a group formed by connecting two or more of the groups mentioned above,in Chemical Formula 3,Ar3, Ar4, Ar5, and Ar6 are, each independently, one selected from hydrogen, deuterium, halogen, a C1-C30 alkyl group, a C6-C50 aryl group, a C3-C50 heteroaryl group, and a C3-C30 cycloalkyl group,L2 is one selected from a single bond, a C6-C50 arylene group, and a C5-C50 heteroarylene group,Y is nitrogen (N) or CH2,g and h are, each independently, integers from 1 to 4,when g is 2 or more, any two of a plurality of Ar5 that are adjacent are optionally bonded to form a fused ring structure of a monocyclic or polycyclic, C6-C30 aromatic group or C3-C30 heteroaromatic group, and one or more of hydrogens of the fused ring structure are optionally substituted with a substituent selected from deuterium, a C1-C10 alkyl group, a C6-C20 aryl group, and a C3-C20 heteroaryl group, andwhen h is 2 or more, any two of a plurality of Ar6 that are adjacent are optionally bonded to form a fused ring structure of a monocyclic or polycyclic, C6-C30 aromatic group or C3-C30 heteroaromatic group, one or more of hydrogens of the fused ring structure are optionally substituted with a substituent R13, and R13 is at least one selected from deuterium, a C1-C10 alkyl group, a C6-C20 aryl group, and a C3-C20 heteroaryl group.

14. The organic light emitting diode of claim 13, wherein the organometallic compound represented by Chemical Formula 1 is one of Compounds GD1 to GD20 below:

15. The organic light emitting diode of claim 13, wherein the compound represented by Chemical Formula 2 is one of Compounds GHH1 to GHH30 below:

16. The organic light emitting diode of claim 13, wherein the compound represented by Chemical Formula 3 is one of Compounds GEH1 GEH30 below:

17. The organic light emitting diode of claim 13, wherein a plurality of light emitting parts are present between the first electrode and the second electrode, andthe plurality of light emitting parts forms a structure connected with a charge generation layer disposed between the plurality of light emitting parts.

18. An organic light emitting diode display device comprising:a substrate;a driving element positioned on the substrate; andthe organic light emitting diode according to claim 1, which is positioned on the substrate and connected to the driving element.

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